1 Ocak 2020 Dergi makalesi Açık Erişim

Karakus, Osman; Ekmekci, Fehmi

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/8925</identifier>
  <creators>
    <creator>
      <creatorName>Karakus, Osman</creatorName>
      <givenName>Osman</givenName>
      <familyName>Karakus</familyName>
      <affiliation>Ankara Univ, Dept Astron &amp; Space Sci, Fac Sci, TR-06100 Ankara, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Ekmekci, Fehmi</creatorName>
      <givenName>Fehmi</givenName>
      <familyName>Ekmekci</familyName>
      <affiliation>Ankara Univ, Dept Astron &amp; Space Sci, Fac Sci, TR-06100 Ankara, Turkey</affiliation>
    </creator>
  </creators>
  <titles>
    <title>A Survey Of Extended Matter Around Chromospherically Active Binary Systems</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2020</publicationYear>
  <dates>
    <date dateType="Issued">2020-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/8925</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1017/pasa.2020.5</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
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  <descriptions>
    <description descriptionType="Abstract">We present an analysis of colour excess (CE) observations for 13 chromospherically active binary systems, together with 27 inactive reference stars of similar spectral types and luminosity classes of the components of these 13 binaries. We used the observations which were made by Johnson-Cousins BVRcIc, 2MASS, and WISE photometric systems. Our new photometric BVRcIc observations were obtained by means of 1 m telescope at TUB.ITAK National Observatory and 40 cm telescope at Ankara University Kreiken Observatory. To check the existence of extended matter around an active binary component(s) of these 13 binary systems, we examined the CE values at around primary/secondary minima and outside eclipses. The comparison of these CEs, obtained relative to those of reference stars of the same (B - V). colours, especially during primary minima with those of secondary minima and outside eclipses, showed that these systems have greater excess radiation in primary minima than in both secondary minima and outside eclipses. We observed that the colour excesses, in general, most likely arise from the extended matter around the cooler component of a binary system. The comparison of CE values also showed that the extended matter of some of these systems was most likely covered or affected both of their components. Since no observational data were obtained during primary minimum of RW UMa, by excluding this binary system, an examination of the locations of cool and active components of the remaining 12 systems of this study on Hertzsprung-Russell diagram, together with corresponding evolutionary tracks, showed that most of the active binary systems have an extended matter not only caused from stellar activity but also more likely caused from evolutionary processes.</description>
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